Democratic presidential hopeful, Sen. Barack Obama, D-Ill., arrives at Indianapolis International Airport in Indianapolis, Tuesday, May 6, 2008, on his way to North Carolina. Voters in both Indiana and North Carolina crowd polling places Tuesday for the states' primary elections.
(AP Photo/Jae C. Hong)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., and his wife Michelle get on a campaign charter at Indianapolis International Airport in Indianapolis, Tuesday, May 6, 2008, on their way to North Carolina. Voters in both Indiana and North Carolina crowd polling places Tuesday for the states' primary elections. (AP Photo/Jae C. Hong)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., left, chats with his wife Michelle Obama as they arrive at Raleigh-Durham International Airport in Raleigh, N.C.,Tuesday, May 6, 2008.
(AP Photo/Jae C. Hong)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., greets supporters in Raleigh, N.C.,Tuesday, May 6, 2008. Voters in both North Carolina and Indiana are crowding polling places Tuesday for the states' primary elections, the largest remaining contests in the Democratic presidential nomination struggle between Obama and Sen. Hillary Rodham Clinton.
(AP Photo/Jae C. Hong)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., holds a glass of beer as he greets people at Raleigh Times bar in Raleigh, N.C.,Tuesday, May 6, 2008. Voters in both North Carolina and Indiana are crowding polling places Tuesday for the states' primary elections, the largest remaining contests in the Democratic presidential nomination struggle between Obama and Sen. Hillary Rodham Clinton.
(AP Photo/Jae C. Hong)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., center, his wife Michelle, third from right, and David Axelrod, left, chief strategist for the Obama campaign, look at posters at 'Go Tell Mama! The Officially Unofficial Obama Art Show' in Raleigh, N.C.,Tuesday, May 6, 2008. (AP Photo/Jae C. Hong)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., greets supporters in Raleigh, N.C.,Tuesday, May 6, 2008. Voters in both North Carolina and Indiana are crowding polling places Tuesday for the states' primary elections. (AP Photo/Jae C. Hong)
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Democratic presidential candidate Barack Obama talks with two voters outside the polling location at Hinkle Fieldhouse on the campus of Butler University in Indianapolis, May 6, 2008.
(Brent Smith/Reuters)
A voter awaits the arrival of U.S. Democratic presidential candidate Senator Barack Obama (D-IL) outside a polling place at Butler University in Indianapolis May 6, 2008. Indiana and North Carolina will hold presidential primaries on Tuesday. REUTERS/Jason Reed
Supporters of Democratic presidential candidate Senator Barack Obama (D-IL) hold a sign on state route 31 in Kokomo, Indiana May 6, 2008.
(Jeff Haynes/Reuters)